Overkill (noun)

1. An excessive or extreme amount of something.
2. The use of more force than is necessary.

Origin:

Derived from the phrase "over the top" which means "excessive".

Examples:

1. The use of atomic bombs on Japan was an overkill.
2. The punishment for a minor infraction was an overkill.
3. Using a sledgehammer to drive in a thumbtack is an overkill.
4. Politicians are often criticized for their overkill in speeches and promises.
5. The company's new advertising campaign was criticized as an overkill.